*I* think Casahot is a waste of time (and of carbon life forms). I tune in to RLC or VHTV for as much as observing human behavior as I do for the boinking. But I know I'm in the minority. Society (aka 16-25 yr olds) rarely have made love - they just have sex. They seek out companions to have sex with - not a life long partner to build a relationship/family with. Monogamy often takes a back seat to hot-n-heavy screwing.
Yes, to get people to buy a membership, there has to be sex and lots of it. Relationship (emotions) will not bring other 20 somethings to buy membership. Yes, there are exceptions (RLC's Leora/Paul & Maya/Stepan). In fact, I give RLC credit for having couples who show affection (emotion) on their site.
As I see it, RLC caters to those who want to observe different relationships. VHTV is all about the "fuck-n-suck". There's room for both to succeed.